ISPCONFIG3 empty APS list

Hi gurus
I have installed the Ubuntu 14.10 Perfect Server and ISPCONFIG3.
The server is on my LAN and I access it from my PC through the router.

But when I go to the "Site" tab and try to update the package list, it remains empty.
This is where I should find Joomla or Wordpress, right?

The connections work as I can reach the outside world from the server and update Linux components.
I have forwarded all ports used by ISPCONFIG in the router.
I have disabled the Bastille firewall and also made sure UFW is removed.

I am out of ideas, so hope someone could point me in the right direction.